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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 9 (BODY CONTROL MODULES)SYSTEM TESTSTEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICEDIAGNOSTIC AIDS
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8

Diagnostic Aids

2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Diagnostic Aids
WARNING: This page is about a different car, the 2002 Chevrolet Monte Carlo, 2002 Chevrolet Impala, 2001 Chevrolet Monte Carlo, and 2001 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

BCM detects that ignition is on and send appropriate power mode message to other modules. BCM must be connected to DLC for any other module to communicate with scan tool. When class 2 serial data circuit is shorted to ground, DTC U1300 or U1305 will be set. If DTC U1300 or U1305 is present, go to DTC U1300: CLASS 2 DATA LINK SHORTED TO GROUND . When class 2 serial data circuit is shorted to power, DTC U1301 or U1305 will be set. If DTC U1301 or U1305 is present, go to DTC U1301: CLASS 2 DATA LINK SHORTED TO POWER .

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • • You are missing required tools, torque specs, or safe lifting equipment.
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